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58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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# GL_SMOOTH
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The most important use case of GL_SMOOTH is lightning:
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when an object is lit, each vertex gets a different color
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depending on the position of the light.
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OpenGL then interpolates the vertices just like in this example,
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giving the illusion of realistic illumination.
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*/
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#include <stdlib.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <GL/glut.h>
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static void display(void) {
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glClear(GL_COLOR_BUFFER_BIT);
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glLoadIdentity();
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glBegin(GL_TRIANGLES);
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glColor3f(1.0f, 0.0f, 0.0f);
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glVertex3f(0.0f, 1.0f, 0.0f);
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glColor3f(0.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f, -1.0f, 0.0f);
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glColor3f(0.0f, 0.0f, 1.0f);
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glVertex3f(1.0f, -1.0f, 0.0f);
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glEnd();
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glFlush();
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}
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static void reshape(int w, int h) {
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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}
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int main(int argc, char** argv) {
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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glutInitWindowSize(500, 500);
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glutInitWindowPosition(100, 100);
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glutCreateWindow(argv[0]);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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if (argc > 1) {
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/* The color of the last point wins. */
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glShadeModel(GL_FLAT);
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} else {
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glShadeModel(GL_SMOOTH);
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}
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glutDisplayFunc(display);
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glutReshapeFunc(reshape);
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glutMainLoop();
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return EXIT_SUCCESS;
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}
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